Copy schema definitions for forms model tables from forms-api

Copies lines 37-48,50-75,85-100 in [forms-api/db/schema.rb] into a new
database migration for this app, so that we have the same tables in the
forms-admin database.

[forms-api/db/schema.rb]: https://github.com/alphagov/forms-api/blob/c1cf1c081020abf779977153fe58f3d73b1af3a8/db/schema.rb

db/migrate/20241230151100_add_forms.rb

@@ -0,0 +1,62 @@
+class AddForms < ActiveRecord::Migration[7.2]
+  def change
+    create_table "forms", force: :cascade do |t|
+      t.text "name"
+      t.text "submission_email"
+      t.text "privacy_policy_url"
+      t.text "form_slug"
+      t.text "support_email"
+      t.text "support_phone"
+      t.text "support_url"
+      t.text "support_url_text"
+      t.text "declaration_text"
+      t.boolean "question_section_completed", default: false
+      t.boolean "declaration_section_completed", default: false
+      t.datetime "created_at", null: false
+      t.datetime "updated_at", null: false
+      t.bigint "creator_id"
+      t.text "what_happens_next_markdown"
+      t.string "state"
+      t.string "payment_url"
+      t.string "external_id"
+      t.string "submission_type", default: "email", null: false
+      t.boolean "share_preview_completed", default: false, null: false
+      t.string "s3_bucket_name"
+      t.string "s3_bucket_aws_account_id"
+      t.string "s3_bucket_region"
+      t.index ["external_id"], name: "index_forms_on_external_id", unique: true
+    end
+
+    create_table "pages", force: :cascade do |t|
+      t.text "question_text"
+      t.text "hint_text"
+      t.text "answer_type"
+      t.integer "next_page"
+      t.boolean "is_optional", null: false
+      t.jsonb "answer_settings"
+      t.datetime "created_at", null: false
+      t.datetime "updated_at", null: false
+      t.bigint "form_id"
+      t.integer "position"
+      t.text "page_heading"
+      t.text "guidance_markdown"
+      t.boolean "is_repeatable", default: false, null: false
+      t.index ["form_id"], name: "index_pages_on_form_id"
+    end
+
+    create_table "conditions", force: :cascade do |t|
+      t.bigint "check_page_id", comment: "The question page this condition looks at to compare answers"
+      t.bigint "routing_page_id", comment: "The question page at which this conditional route takes place"
+      t.bigint "goto_page_id", comment: "The question page which this conditions will skip forwards to"
+      t.string "answer_value"
+      t.datetime "created_at", null: false
+      t.datetime "updated_at", null: false
+      t.boolean "skip_to_end", default: false
+      t.index ["check_page_id"], name: "index_conditions_on_check_page_id"
+      t.index ["goto_page_id"], name: "index_conditions_on_goto_page_id"
+      t.index ["routing_page_id"], name: "index_conditions_on_routing_page_id"
+    end
+
+    add_foreign_key "pages", "forms"
+  end
+end